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The 10 best airlines you've never heard of

The low-cost arm of Iberia has been around since 1994, but remains relatively small with just 44 aircraft - most of which are Bombardiers with a capacity of 100 passengers or fewer. It briefly owned the oddly-named Dutch carrier Denim Air from 1999-2002. "Nostrum" means "remedy" in Spanish - though the English word is usually associated with ineffective or "quack" cures. Which may or may not explain why its planes have never set foot on UK soil.